Issue 6, 1997

Synthesis of lower-valent molybdenum oxides in aqueous solutions by reducing Na2MoO4 with NaBH4

Abstract

Reduction of Na 2 MoO 4 with NaBH 4 in aqueous solutions at ambient temperatures has been investigated systematically by varying the concentration and volume of NaBH 4 as well as the reaction pH. The reduction products have been characterized by X-ray diffraction and differential scanning calorimetry (DSC). The reduction yields metastable, amorphous oxides of lower-valent molybdenum, which crystallize around 350 °C to give the binary oxide MoO 2 and the sodium molybdenum bronze Na 0.88 Mo 6 O 17 . The relative amounts of MoO 2 and Na 0.88 Mo 6 O 17 formed are correlated to the overall reducing power that can be achieved. The concentration and volume of NaBH 4 , the reaction pH and the changes in the degree of condensation of the molybdate ions are all found to influence the overall reducing power.

Article information

Article type
Paper

J. Mater. Chem., 1997,7, 1003-1006

Synthesis of lower-valent molybdenum oxides in aqueous solutions by reducing Na2MoO4 with NaBH4

C. Fo Tsang and A. Manthiram, J. Mater. Chem., 1997, 7, 1003 DOI: 10.1039/A606389F

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